With these headphones, listen to music wirelessly. Also, answer calls, without having to take your cell phone out of your bag. They offer great audio and, thanks to the adjustment of their headphones, you will obtain an ideal acoustic seal to listen only to your music. They also work wired - just connect with a 3.5mm AUX cable (sold separately). They incorporate an MP3 player (from a microSD memory 1 ), and a super rechargeable battery that provides up to 12 hours of continuous playback 2 , so you can listen to your favorite music for a long time. They have a multifunction control on the headset, to answer / hang up calls, manipulate the playback of tracks, adjust the volume and change the playback mode (Bluetooth or microSD).